diff --git a/Cargo.lock b/Cargo.lock
index 931653c0..f621db04 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -588,11 +588,12 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.120"
+version = "1.0.132"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e0d21c9a8cae1235ad58a00c11cb40d4b1e5c784f1ef2c537876ed6ffd8b7c5"
+checksum = "d726bfaff4b320266d395898905d0eba0345aae23b54aee3a737e260fd46db03"
 dependencies = [
  "itoa",
+ "memchr",
  "ryu",
  "serde",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index d919f0c9..55008faf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ streaming-iterator = "0.1.5"
 bitflags = "2.6.0"
 humantime = {version = "2.1.0", optional = true}
 serde = {version = "1.0.203", features = ["derive"], optional = true}
-serde_json = {version = "1.0.120", optional = true}
+serde_json = {version = "1.0.132", optional = true}
 bincode = {version = "1.3.1", optional = true}
 tskit-derive = {version = "0.2.0", path = "tskit-derive", optional = true}
 delegate = "0.12.0"
@@ -36,7 +36,7 @@ anyhow = {version = "1.0.86"}
 clap = {version = "4.4.6", features = ["derive"]}
 serde = {version = "1.0.203", features = ["derive"]}
 serde-pickle = "1.1.0"
-serde_json = {version = "1.0.120"}
+serde_json = {version = "1.0.132"}
 bincode = "1.3.1"
 rand = "0.8.3"
 rand_distr = "0.4.0"